Improvement in the method of making wrist-pins



' UNITED STATES PATENT OFFICE.

E. P. RUSSELL, OF MANLIUS, NEW YORK.

IMPROVEMENT IN THE METHOD OF MAKING WRIST-PINS.

Specification forming part of Letters Patent No. 49,306, dated August 3,1865.

To all whom 'it may concern:

Be it known that l, E. I. RUSSELL, ot' Manlius, in the county of Onondaga and State of New York, have invented a new and Improved Crank-Wrist; and I do hereby declare that the following is a full,clear, and exact description thereof, reference being had to the accompanying drawings, making a part ot` this specilication, in which- Figure 1 is a side view ot' the bearing-box and a portion of the pitman-rod applied to the crank-pin which gives motion to the sickles of a harvesting-machine. Fig. 2 is a vertical section through a chilling-box and the crankpin which is formed therein. Figs. 3 and 4 show the form of a crank-pin when removed from the chilling-box.

Similar letters ot reference indicate corresponding parts in the several figures.

This invention relates to the construction of crank-wrists or wrist-pins for any and all purposes to which th eyare applicable; but for the purpose of more fully illustrating its utility in one instance, I shall refer to it as an improved mode of constructing that portion of a harvesting-machine which is known as the crankwrist or wrist-pin, and which is applied eccentrically to the face ot' a wheel upon a driving-shaft for the purpose ot' receivinga bearing on one end of the pitman which communicates motion to the sickle.

The wrist-piu of aharvestingmachine is subject to considerable friction and probably more strain than any other part of the machine in consequence of the irregular movements of the cutting apparatus and the power which is required to perform the cutting. For these reasons such pins, as hitherto constructed, break or wear'out very rapidly and require frequent renewing.

By my invention I produce a wrist-pin which will withstand all the strain brought upon it, and which willbe very durable, requiring very little or no lubrication, and keeping the pitman-connection in goodworking order for a long time.

To enable others skilled .in the art to understand my invention, I will describe its construction and operation.

In order that I may fully explain the nature and obj ect of my invention, I have illustrated in Fig. 1 of the accompanying drawings the mode of applying the pitman ot' a sickle to a wristpin. In this figure, A represents the wrist-pin, which is secured by means of a nut to the face of a wheel, B, that is keyed on one end of a driving-shaft. The pitman C is applied to a two-part bearing-box, I), which is chilled, and

which embraces the neck or journal of the pin A, and is held in place thereon by the enlarged l cylindrical head of said pin, as shown in Fig. 4. The two parts of the box D are held together by means of bolts and jam-nuts, the heads ofthe bolts forming bearings for a pivoted yoke, E, which receives the end of the pitman-rod C and allows it to accommodate itself to the movements ofthe cutting apparatus. By the rotation ofthe wheel B the pitman-rod C receives a lengthwise reciprocating motion, which it communicates to the sickle.

The position of the pinAand the work which it is required to perform renders it very important that this pin should not wear away rapidly and cause the parts connected directly and indirectly with it to work loose or with a jerking movement. To obviate these objections I construct a wrist-pin in the following manner: G represents atlask or box in which the pins are produced. This box is made ot' metal, with a cylindrical cavity, a, and a deep cylindrical cavity, b, formed in it, as shown in Fig. 2, which latter terminates at the bottom in a central hole, c, passing through the box. Such an opening in the box corresponds in size and shape to the wrist-pin A, with the exception that when this pin is produced it has a cylindrical extension, c', on its lowerend of greater length than the depth of the central hole, c, through the ask. This flask Gr, being made of metal, becomes a ch illing-box for chilling the metal which is poured into it to form the body ot' the wrist-pin.

As it is not desired to have the entire pin chilled, but only that portion which constitutes the head c' andthe neck or journal b', I employ aV wrought-metal pin or core, A', whichis i inserted into and through the cavity of the chill-box G, so that its lower e-nd will project a suitable distance through the centralhole, c, and serve when the pin is finished as a male screw stem for receiving a nut by which to se cure this pin rigidly to its wheel B.

The core-pin A is properly centered in the cavity of the chill-box B, and the metal is poured around it, as shown in Fig. 2, after which the upper end of the core-pin may be hammered down and the wrist-pin removed from its box.

If desirable, the screw-thread shown in Fig. 4 may be cut on the projecting end of the corepin Apreviously to introducingthis pin into the chilling-box, and, if desirable, the upper end of the core-pin may beV flattened or squared, as

' shown in Fig. 3; but for all practical purposes a cylindrical core-pin will be found to answer the desired object.

By thus producing a wrist-pin I obtain a chilled or hardened surface Where the pin is subject to Wear, and at the same time secure the advantages of a strong wrought-metal or less hard metal pin for receiving the nut which secures the Wrist-pin rigidljT to its Wheel or crank and adding strength to the metal of' greater brittleness.

It Will thus be seen that I overcome a serious defect in all pitlnan-connections which employ a removable crank-Wrist or Wrist-pin, and also that when the said invention is applied to the end of said journal, the two metals beingunited mechanically in the casting of the former around the latter, substantially as and for the purposes set forth.

E. P. RUSSELL.

Witnesses:

AUGs. TREMAIN, C. W. TYLER. 

